Krohn-Hite 511 User manual

Model 511
10 ppm Precision DC Source/ Calibrator
Operating Manual.

Model 511
10 ppm Precision DC Source/ Calibrator
Operating Manual
Unit 4 15 Jonathan Drive, Brockton, MA 02301-5566
Tel: [phone], Fax: [phone]
www.krohn-hite.com, e-mail [email protected]
Printed in U.S.A.
Version 1.05
Revised April 2003
Copyright © 2003 Krohn-Hite Corporation All rights reserved. No part of this publication may
be reproduced, stored in a retrieval system or transmitted in any form by any means, electronic,
mechanical photocopying, recording, or otherwise, without the prior written permission of
Krohn-Hite Corporation
Information furnished in this manual is believed to be accurate and reliable. However, no responsibility is
assumed by Krohn-Hite Corporation for its use; nor for any infringements of patents or other rights of
third parties which may result from its use.

i
Table of Contents
Section Title Page
1 General Description and Specifications................................................................... 1-1
1-1. Introduction ............................................................................................... 1-1
1-2. Description ................................................................................................ 1-1
1-3. Safety Information..................................................................................... 1-2
1-4. Krohn-Hite Contact Information ............................................................... 1-3
1-5. Factory Calibration.................................................................................... 1-3
1-6. Specifications ............................................................................................ 1-4
1-7. Output Specifications ............................................................................. 1-4
1-8. Secondary Performance Specifications .................................................. 1-4
1-9. General Specifications............................................................................ 1-5
1-10. Options ................................................................................................... 1-6
2 Operation ................................................................................................................... 2-1
2-1. Introduction ............................................................................................... 2-1
2-2 Unpacking.................................................................................................. 2-1
2-3 Power Requirements.................................................................................. 2-2
2-4 Front Panel................................................................................................. 2-2
2-4-1 Front panel controls .................................................................. 2-2
2-4-2 Front panel indicators ................................................................ 2-3
2-4-3 Output Terminals ...................................................................... 2-3
2-5 Rear Panel.................................................................................................. 2-4
2-5-1 AC Power Entry Module ........................................................... 2-4
2-5-2 Optional Output Terminals ........................................................ 2-7
3 Incoming Acceptance ............................................................................................... 3-1
3-1. Introduction ............................................................................................... 3-1
3-2. Recommended Test Equipment.............................................................. 3-1
3-3. Warm-up Procedure................................................................................ 3-2
3-4. DC Voltage Verification Test.................................................................... 3-2
3-5. Optional Tests............................................................................................ 3-3
3-6. DC Voltage Load Regulation Test ......................................................... 3-3
3-7. DC Voltage Output Noise Test............................................................... 3-4

Model 511
Operating Manual
ii
List of Illustrations
Section Title Page
2 Operation ...................................................................................................................
2-1. 511 Front Panel View.................................................................................2-2
2-2. Front Output Terminals..............................................................................2-3
2-3. 511 Rear Panel View..................................................................................2-4
2-4. 120 Volt Line Setting Example..................................................................2-4
2-5. Power Entry Module Exploded View ........................................................2-6
2-6. Optional Rear Output Terminals ................................................................2-7
3 Incoming Acceptance .................................................................................................
3-1. Load Regulation Setup ...............................................................................3-3
3-2. Noise Check Setup .....................................................................................3-5
List of Tables
Section Title Page
1 General Description and Specifications ...................................................................
1-1. Output Specifications .................................................................................1-4
3 Incoming Acceptance .................................................................................................
3-1. Output Uncertainty Check..........................................................................3-2
NOTE: Errata and addendum (if any) will appear in the back of this manual

1-1
Section 1
Introduction and Specifications
1-1 Introduction
This manual provides the user with the information needed to operate the Krohn-Hite
Model 511. Section 3 is a procedure used to verify that the DC Calibrator is within the
published specifications. Calibration information is included in the Krohn-Hite Model
511 Calibration manual. Details for contacting Krohn-Hite and important safety
information are also contained within this manual.
Note: If the Model 511 is still under warranty and it is outside its specified limits,
contact Krohn-Hite or your distributor to establish the course of action.
1-2 Description
The Model 511 DC Voltage Source / Calibrator is a highly versatile reference source,
designed to meet the needs of computer systems, production line testing, QC and QA
departments, design labs, and standards laboratories. The instrument has specified
accuracies traceable to the U. S. National Institute of Standards and Technology.
The Model 511 includes a "crowbar"or short circuit of the output and a true bipolar
output stage that can be floated 500 volts from chassis. Output and sense terminals are
gold plated, low thermal, safety, type, whose sense connection is selected via a front
panel 2 wire - 4 wire sense switch, that negates the need for using cumbersome shorting
links.
Resolution of each range is 1 part per million. The instrument is a highly accurate
reference that can be used for calibration of digital voltmeters, analog meters,
semiconductor analyzing systems, analog references for computers, analog-to-digital
converters, telemetry and data acquisition systems, and wherever a stable source is
required.
There are no adjustments made during normal operation. All adjustments are made
during the factory calibration. The circuitry is completely solid state made of discrete,
hybrid and/or integrated circuits packaged on etched glass circuit boards. These are
proven circuits, using derated components to insure long life and maximum reliability.
The instrument is overload and short-circuit protected, and is fully operational in normal
environmental conditions. The 511 will drive a short circuit indefinitely without damage
to the instrument, and will recover to rated specifications in less than 100µs.

Model 511
Operating Manual
1-2
1-3 Safety Information
The Model 511 has been designed, tested and supplied in a safe condition. The following
general safety precautions must be observed during all phases of operation, service, and
repair. Failure to comply with these precautions or with specific warnings elsewhere in
this manual violates safety standards of design, manufacture and intended use of this
instrument. Krohn-Hite assumes no liability for the customer's failure to comply with
these requirements.
This manual contains information and warnings that must be observed to keep the
instrument in a safe condition and ensure safe operation. Operation or service in
conditions or in a manner other than specified could compromise safety. For the correct
and safe use of this instrument, operating and service personnel must follow generally
accepted safety procedures.
To avoid injury or fire hazard, do not switch on the instrument if it is damaged or
suspected to be faulty. Do not use the instrument in damp, wet, condensing, dusty or
explosive gas environments.
Whenever it is likely that safety protection has been impaired, make the instrument
inoperative and secure against any unintended operation, and then inform qualified
personnel. Safety protection is likely to be impaired if, for example, the instrument
shows visible damage, or fails to operate normally.
Ground the Instrument
To minimize shock hazard, the instrument chassis and cabinet must be connected to an
electrical ground. Any interruption of the protective ground conductor inside or outside
the instrument is likely to make the instrument dangerous. Intentional interruption is
prohibited.
Do Not Operate In an Explosive Atmosphere
Do not operate the instrument in the presence of flammable gases or fumes. Operation of
any electrical instrument in such an environment constitutes a definite safety hazard.
Keep Away From Live Circuits
Operating personnel must not remove instrument covers. Qualified maintenance
personnel must make component replacement and internal adjustments. Under certain
conditions, dangerous voltages may exist. To avoid injuries, always disconnect input
voltages before removing the covers. Use caution when working with voltages above 30
Vac rms, 42 V peak, or 60 Vdc. These voltages pose a shock hazard A good safety
practice is to expect that hazardous voltage is present in any unknown circuit before
measuring.

General Description and Specifications
Safety Information
1-3
Do Not Substitute Parts or Modify Instrument
Because of the danger of introducing additional hazards, do not install substitute parts or
perform any unauthorized modifications. Use only the replacement fuse(s) listed in this
manual. Return the unit to the Krohn-Hite Service Department to modify or repair the
instrument to ensure that safety features are maintained.
Do Not Operate a Damaged Instrument
Whenever it is possible that the safety protection features built into this instrument have
been impaired, either through physical damage, excessive moisture, or any other reason,
REMOVE the POWER and do not use the instrument until safe operation can be verified
by service-trained personnel. If necessary, return the instrument to the Krohn-Hite
Service Department for service and repair to ensure that the safety features are
maintained.
1-4 Krohn-Hite Contact Information
To order parts, accessories, or obtain service call:
1-508-580-1660
Or, visit the Krohn-Hite Web site at www.krohn-hite.com
1-5 Factory Calibration
When manufactured, all 511’s are aged, calibrated and thoroughly verified with test
equipment and calibration standards that are traceable to the U.S. National Bureau of
Standards. Included with each shipment is a certificate of calibration.
A performance verification procedure is provided in section three. This procedure can be
used to make certain that the calibrator is with-in specifications. Verification is usually
preformed when you first take delivery of the calibrator to make sure that there was no
shipping damage, when you have questions about the calibrator’s accuracy, or after
calibration
Krohn-Hite Corporation recommends that the Model 511 be calibrated yearly at Krohn-
Hite’s service center to sustain factory new performance. All calibrators returned to the
factory for calibration have pre and post calibration data recorded. This allows a
performance history file to be complied for each unit. Minor updates are installed (if any
are available) during recalibration

Model 511
Operating Manual
1-4
1-6 Specifications
Prior to shipment, the Model 511 calibrators are calibrated and data is recorded to
guarantee that the unit is operating with-in specifications. Output Specifications listed
below are absolute accuracies and are traceability to N.I.S.T.
1-7 Output Specifications
The output uncertainty specifications apply after a one hour warm-up under standard
reference conditions of 23ºC ± 1ºC and <70% relative humidity.
Range Full Scale
Resolution
(1ppm)
Absolute Accuracy
(1 year)
100mV ±111.1110 mV 100 nV ±(10ppm of setting + 2µV)
1V ±1.111110 V 1 µV ±(10ppm of setting + 6µV)
10V ±11.11110 V 10 µV ±(10ppm of setting + 42µV)
Table 1-1 Output Specifications
Note: The specifications listed above are valid for one year calibration cycle.
1-8 Secondary Performance Specifications
Stability:1
24 hrs, ± (2ppm of setting +1µV)
Temperature Coefficient:
0º C to 10º C, ± (3ppm of setting +2µV)/ºC
10º C to 40º C, ± (2ppm of setting +1µV)/ºC, typ ± 1ppm/ºC
Noise and Ripple (0.1Hz to 100kHz):
100mV and 1V range, 5µV rms; typ < 3µV rms
10V range, 10µV rms; typ < 5µV rms
Low Frequency Noise (0.1Hz to 10Hz):
2µV p-p.
Maximum Load:
100mA all ranges.
1Stability specifications apply after initial stabilization of one hour, constant ambient
temperature ± 1ºC , constant line and load.